How much would it cost to send a 1kg parcel to Italy?

• low cost business phone service
• phone service providers
• mobile phone carriers
• cost of replacement windows
• cost of long term care
• italy s language
• study abroad italy

So i sold a phone on ebay worth £150. How much would it cost to send it to Italy? People are telling me it should cost around £10 but on the website im getting aorund £16 so i dont know how much p&p i should charge the buyer. And im kind of lost on what to say when at royal mail, so i go royal mail and what do i ask for? 1st class signed for italy?

How much would it cost to send a 1kg parcel to Italy?